On Fri, Jan 08, 2010 at 04:14:14PM +0100, Peter Paul wrote:> The brightness control keys (Fn+F7 & Fn+F8) only work when adding this boot parameter.> They do not create any events for the OS but work even when in BIOS or GRUB, but not in Linux without said kernel parameter.> Userspace tools are able controlling brightness using standard methods regardless of any ACPI parameters, they only seem to affect the keys themselves.

What do you mean by "work"? Do you get any ACPI interrupts when you hit the keys without the override parameter?